TMS320F2812: Accuracy Confirmation

Elisha Tarroza71

Part Number: TMS320F2812

Hello!

Just need help confirming if I'm understanding the datasheet correctly:

If the device is used in external reference mode as mentioned on page 106 (D.), then the overall accuracy will then be +/-50 LSB as shown in table 5-42?

Thank you!

over 6 years ago

0 Marlyn Rosales Castaneda20 over 6 years ago

TI__Mastermind 25800 points

Hi Elisha,

The +/- 50 LSBs that is referenced in table 5-42 is only in regards to the gain error. If you wish to know the overall accuracy then you will need to take into account the offset and linearity error as well.

Best Regards,

Marlyn

0 Elisha Tarroza71 over 6 years ago in reply to Marlyn Rosales Castaneda20

TI__Expert 3700 points

Thanks Marlyn!

For linearity -- are the the DNL and INL specs?
And offset -- offset error?

Does it mean then that the correct overall accuracy is +/-52.5?

Thank you!!

0 Marlyn Rosales Castaneda20 over 6 years ago in reply to Elisha Tarroza71

TI__Mastermind 25800 points

Elisha,

Elisha Tarroza71 said:
For linearity -- are the the DNL and INL specs?
And offset -- offset error?

For linearity and offset errors we do not distinguish them based on which reference mode was used. The values in table 5-42 should be applicable to both modes.

Elisha Tarroza71 said:
Does it mean then that the correct overall accuracy is +/-52.5?

Have you corrected for offset and gain error? Please refer to this similar post: https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/860435

Best Regards,

Marlyn

0 Marlyn Rosales Castaneda20 over 6 years ago in reply to Marlyn Rosales Castaneda20

TI__Mastermind 25800 points

Elisha,

Another important consideration is that using an external reference source will contribute error as well. The gain error associated to using an external reference source is assuming a clean DC source within +/- 0.1% of 1V without including real-word errors, unlike the gain error with internal reference.

Best Regards,

Marlyn

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TMS320F2812: Accuracy Confirmation